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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 9/45 // - 9/45
3/n-(9/45) = 0
3/n-1/5 = 0
3*n^-1 = 1/5 // : 3
n^-1 = 1/15
-1 < 0
1/(n^1) = 1/15 // * n^1
1 = 1/15*n^1 // : 1/15
15 = n^1
n = 15
n = 15
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